Answer:
yes there are a lot of boys on this platform
A rock is kicked horizontally off a dock into the bay 3
times with a higher initial velocity each time as shown to the right. Which of the following statements is true regarding
these scenarios? AND WHY?
(a) The rock takes the longest time to hit the water in
case 3
(b) The rock takes about the same time to hit the water
in each case
(c) The rock hits the water below with the highest speed
in case 1
(d) The rock hits the water with the same speed in each|
case
Student Answer(s):
Student Reasoning:
Answer:
The true statement is;
(b) The rock takes about the same time to hit the water in each case
Explanation:
The given information are;
The direction in which the rock is kicked = Horizontally
The number of different initial horizontal with which the rock as kicked = different horizontal velocity
The time taken for the rock to hit the water is given by the following equation for projectile motion;
y = y₀ + v₀× sin(θ₀)×t - 1/2×g×t²
Where;
θ = The angle the rock makes with the horizontal when it was kicked = 0
y = The height through which the rock drops
y₀ = The initial height of the rock
t = The time taken for the ball to hit the water
g = The acceleration due to gravity ≈ 9.81 m/s²
For the different speeds, v₁, v₂, and v₃, we have;
y = y₀ + v₁× sin(0)×t - 1/2×g×t² = y₀ - 1/2×g×t²
y = y₀ + v₂× sin(0)×t - 1/2×g×t² = y₀ - 1/2×g×t²
y = y₀ + v₃× sin(0)×t - 1/2×g×t² = y₀ - 1/2×g×t²
Therefore, the time it takes for the ball to hit the water is given as follows;
[tex]t = \sqrt{\dfrac{(y_0 - y) \times 2}{g} }[/tex]
Which is the same for each case
However, the speed, v, with which the rock hits the water is given by the following equation;
[tex]v = \sqrt{v_x^2 + v_y^2}[/tex]
[tex]v_y[/tex] = The vertical velocity = v₀ × sin(θ₀) - g×t = v₀ × sin(0) - g×t = -g×t
[tex]v_y[/tex] = -g×t
Therefore, [tex]v_y[/tex], is the same for all three times
While vₓ = v₁, v₂, and v₃, for each of the three times.
Therefore, [tex]v = \sqrt{v_x^2 + v_y^2}[/tex] the speed with which the rock hits the water is different for all three times.
A boy is going down a slide. As he reaches the bottom, friction causes him to slow down and stop. Which one of Newton's laws is this?
2nd law
3rd law
1st law
4th law
The given condition satisfies the Newton's First Law of motion. Hence, option (C) is correct.
Given data:
A boy slides down and friction causes him to slow down and stop.
In the given problem, when boy was sliding down, then he was in the state of motion, such that the when the he reaches at the bottom of hill, the friction plays the role of external agent to stop its motion.
This shows that the first law of motion is clearly followed which says that, "If an object is in motion, then it will be in motion until and unless any external force is applied on it". This is also known as law of inertia.
Thus, we can conclude that the given condition satisfies the Newton's First Law of motion. Hence, option (C) is correct.
Learn more about the Newton's first law of motion here:
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All students perceive poor grades as disappointing.
Please select the best answer from the choices provided
Т
F
Answer:
False
Explanation:
i need help with #3 plz and thank you
Katrina’s recipe for orange muffins calls for 400 grams of flour. How many kilograms of flour are in the recipe?
Answer:
0.4 Kilograms of flour
Explanation:
If you convert 400 grams into kilograms (400 ÷ 1,000), you would get 0.4 kilograms.
Give two examples of energy being transformed from one type to another
Answer:
Explanation:
For example, an ice cube has heat energy and so does a glass of lemonade. If you put the ice in the lemonade, the lemonade (which is warmer) will transfer some of its heat energy to the ice.
Why are ions formed?
Group of answer choices
A.Because atoms have the same number of protons and electrons
B. Because atoms want 8 valence electrons
C. To make our lives difficult
D. Because atoms gained neutrons
Answer:
B. Because atoms want 8 valence electrons
Explanation:
Ions are formed because atoms want 8 valence electrons. Most atoms attain stability when they 8 electrons in their outermost shell.
This is the reason why they form ions.
To form ions, atoms will gain or lose electrons or share them. This loss, gain, or sharing of electrons often lead to an atom become stable. One group of atoms, the noble gases, do not form ions readilyThey have complete numbers of electrons in their valence shells. So they do not gain, lose or share their electrons to form ions unlike the others.the energy lost between trophic levels why?
Answer:
Explanation:
Energy decreases as it moves up trophic levels because energy is lost as metabolic heat when the organisms from one trophic level are consumed by organisms from the next level. Trophic level transfer efficiency (TLTE) measures the amount of energy that is transferred between trophic levels
The two factors that determine velocity are
A: speed and direction
B: direction and speed
C: position and rate
D:distance and mass
PLEASE HELP ME
Answer:
A: speed and direction
A student lifts a school bag from the ground and puts it on his shoulders 1.5m above the ground. A force of 5N is acting on an object. Calculate the work done by him on the school bag.
Answer:
w = 7.5 [J]
Explanation:
We must remember the definition of mechanical work, which tells us that work is equal to the product of force by distance. This force must be applied in the direction of movement. So we have the following equation:
w = F*d
where:
w = work [J]
F = force [N]
d = distance [m]
Now replacing we have:
w = 5*1.5
w = 7.5 [J]
HEY CAN ANYONE PLS ANSWER DIS!!!!
Answer:
A) distillation.
Explanation:
Benzene boils at 81∘C while chloroform at about 61∘C. The separation can be done by distillation.
please mark me brainliest! hope this helps, god bless :)
Why is thermal energy classified as kinetic energy?
Answer:
Thermal energy is an example of kinetic energy, as it is due to the motion of particles, with motion being the key. Thermal energy results in an object or a system having a temperature that can be measured. Thermal energy can be transferred from one object or system to another in the form of heat.
Explanation:
Answer:
Thermal energy is an example of kinetic energy, as it is due to the motion of particles, with motion being the key. Thermal energy results in an object or a system having a temperature that can be measured. Thermal energy can be transferred from one object or system to another in the form of heat.
Explanation:
a standby generator is connected to fifteen 40w and a musical 600w amplifying system. how many energy is used up if the generator run 6hours
pls someone answer the question fast
Answer:
1200 watts
-hope this helps
is the universe infinite
Answer:
The observable universe is still huge, but it has limits. because it's most likely like an plane all round.
Explanation:
Answer:
Yes
Explanation:
the universe is constanlty expanding at a rate of 74.3 plus or minus 2.1 kilometers (46.2 plus or minus 1.3 miles) per second per megaparsec (a megaparsec being about 3 million light-years).
How does the earthquake magnitude work
Answer:
The magnitude of an earthquake is determined from the logarithm of the amplitude of waves recorded by seismographs. Adjustments are included in the magnitude formula to compensate for the variation in the distance between the various seismographs and the epicenter of the earthquakes.
Explanation:
have a good day
Student is attempting to hit a target 4 meters from the edge of the desk that is 1.4 m tall marble rules of a table horizontally as shown below according to the above information in diagram what velocity must a marble have to strike the target?
Answer:
The correct option is;
7.49 m/s
Explanation:
The time it takes the marble to fall vertically is given by the equation
s = u·t + 1/2·g·t²
Where;
s = The height of the table = 1.4 m
u = The initial vertical velocity = 0 (The marble is given only an initial horizontal push (velocity))
g = The acceleration due to gravity = 9.81 m/s²
t = The time it takes the marble to reach the ground 1.4 m below
Plugging in the values. gives;
1.4 = 0×t + 1/2 × 9.81 × t²
∴ t² = 1.4/(1/2 × 9.81) ≈ 0.28542 s²
t = √0.28542 ≈ 0.5342s
The horizontal range the marble is to cover in the approximately 1.87 seconds before it reaches the ground = 4 meters
Therefore, the velocity that allows the marble to reach 4 meters in 1.87 seconds is give as follows;
Velocity = Distance/Time = 4 m/(0.5342 s) ≈ 7.49 m/s
Therefore the horizontal velocity the marble must have to strike its target is approximately 7.49 m/s.
A biker starts moving from rest with a constant acceleration of 2.0 m/s^2. What is his velocity after 5.0 s?
a = v-u/t
2 = v - 0 / 5
2 = v/5
v = 10 m /s
what is a blastocyst definition
Answer: Explanation:
Blastocyst, a distinctive stage of a mammalian embryo. It is a form of blastula that develops from a berrylike cluster of cells, the morula. A cavity appears in the morula between the cells of the inner cell mass and the enveloping layer.
Two football players have a head-on collision and grab onto each other's uniforms. The 80
kg Pennridge Ram was moving at 3 m/s, while the 70 kg Souderton player was moving in
the opposite direction at 2.5 m/s. What is their final velocity after impact?
What is a non-example of Newton's 3rd law of motion?
Answer:
Unbalanced forces are not examples of Newton's third law because not all opposite reactions are unbalanced forces.
Explanation:
Which process is involved in the formation of a galaxy
Answer:
SUN
Explanation:
EARTH
Acar accelerates from 5 ms to 27 mis in 10 seconds. What is the acceleration in m/s??
Explanation:
Acceleration is final velocity minus initial velocity divided by time.
a = (v − u) / t
a = (27 m/s − 5 m/s) / 10 s
a = 2.2 m/s²
Which of the following individuals would be best classified as being in identity diffusion?
A.
Pauline isn’t interested in politics because she’d like to enjoy being a kid longer.
B.
Richard has decided to become a Democrat after much soul searching.
C.
Maria has adopted her parents’ identification as Protestant without considering other options.
D.
Pierce is trying many different identities but hasn’t decided on one yet.
Answer: C
Explanation: after reading it over and over shes the most reasonable. But I could be wrong so be cautious.
According to the question, Maria would be best classified as being in identity diffusion. So, option (C) is correct answer.
What is identity diffusion?
People who are experiencing identity diffusion haven't chosen an ideological or occupational route for the future and aren't making any effort to do so. Identity diffusion occurs during adolescence, a time when individuals are attempting to define their identities, but it can also last into adulthood.
When a person isn't actively forming an identity or committing to one, identity diffusion happens.Many people go through a phase of identity diffusion in their early years of adolescence or in childhood, which they eventually grow out of. Long-term identity diffusion is yet conceivable.James Marcia created four "identity statuses" in the 1960s, and identity diffusion is one of them. These identity statuses are a continuation of Erik Erikson's research on the formation of teenage identities.In the question, Maria has adopted her parents’ identification as Protestant without considering other options. She haven't chosen an ideological or occupational route for the future and aren't making any effort to do so. So, Maria would be best classified as being in identity diffusion.
To learn more about identity diffusion, refer the link:
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The drawing shows a 26.1-kg crate that is initially at rest. Note that the view is one looking down on the top of the crate. Two forces, and , are applied to the crate, and it begins to move. The coefficient of kinetic friction between the crate and the floor is k = 0.347. Determine the (a) magnitude and (b) direction (relative to the x axis) of the acceleration of the crate.
Answer:
(a). The magnitude of the acceleration of the crate is 1.44 m/s².
(b). The direction of the crate is 34.60°.
Explanation:
Given that,
Mass of crate = 26.1 kg
Coefficient of kinetic friction = 0.347
We need to calculate the resultant force
Using figure
[tex]F'=\sqrt{(F_{x}+F_{z})^2+F_{y}^2}[/tex]
Put the value into the formula
[tex]F'=\sqrt{(88\cos{55}+54)^2+(88\sin 54)^2}[/tex]
[tex]F'=126.4\ N[/tex]
(a). We need to calculate the acceleration of the crate
Using formula of sum of force
[tex]\sum{F}=F'-\mu N[/tex]
[tex]ma_{total}=F'-\mu mg[/tex]
[tex]a_{total}=\dfrac{F'}{m}-\mu g[/tex]
Put the value into thr formula
[tex]a_{total}=\dfrac{126.4}{26.1}-0.347\times9.8[/tex]
[tex]a_{total}=1.44\ m/s^2[/tex]
(b). We need to calculate the direction
Using formula of the direction
[tex]\theta=\tan^{-1}(\dfrac{F_{y}}{F_{x}+F_{z}})[/tex]
Put the value into the formula
[tex]\theta=\tan^{-1}(\dfrac{88\sin55}{88\cos55+54})[/tex]
[tex]\theta=34.60^{\circ}[/tex]
Hence, (a). The magnitude of the acceleration of the crate is 1.44 m/s².
The direction of the crate is 34.60°.
When are island-arc volcanoes formed?
Answer:
Its the result from subduction of an oceanic tectonic plate when its under another tectonic plate. Sometimes parallel the oceanic trench. Also if a volcano is offshore, it forms islands, which will result in a volcanic type of island arc.
Explanation:
Hope this helps! If this wasn't the answer you were looking for, please don't hesitate to comment here or private message me. Also if you have any other questions concerning something you don't know or want to learn about, also private message me or comment here! Have a nice day/night!! :))
1.Which of the following are examples of projectile motion
a. a airplane taking off
b.a tennis ball lobbed over a net
c. a plastic disk sailing across a lawn
d.a hawk diving to catch a mouse
e. a parachutist drifting to Earth
f. a frog jumping from land into the water
Answer:
b and f
Explanation:
Following are examples of projectile motion: a. A tennis ball lobbed over a net c. A plastic disk sailing across a lawn d. A hawk diving to catch a mouse e. A parachutist drifting to Earth. The correct options are A, C, D and E.
Projectile motion refers to the motion of an object that is launched into the air and moves along a curved trajectory under the influence of gravity alone, with no other forces acting horizontally. In projectile motion, the object follows a path called a parabola.
In the given options, a tennis ball being lobbed over a net, a plastic disk sailing across a lawn, a hawk diving to catch a mouse, and a parachutist drifting to Earth all demonstrate projectile motion. In each case, the objects are initially launched or propelled into the air and subsequently follow a curved path influenced primarily by gravity. The trajectory of these objects can be described by a parabolic shape, which is a characteristic of projectile motion.
The correct options are A, C, D and E.
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NEED HELP ASAP PLS (with work)
A punt is kicked at an angle of 60 with a speed of 40 m/s, and lands at the same
height from which it was kicked.
How far away will the ball land?
What is the maximum height reached by the ball?
What is the hang time? Total
Answer:
1) The ball will land approximately 141.4 m away from where it was kicked
2) The maximum height reached is approximately 61.22 m
3) The total hang time is approximately 7.07 seconds
Explanation:
First we list out the known parameters
The direction in which the punt is kicked, θ = 60°
The speed with which the punk is kicked, v₀ = 40 m/s
1) The distance away (the range, R) the ball will land is given by the equation;
[tex]R = \dfrac{v_0^2 \times sin(2\cdot \theta)}{g}[/tex]
Where;
g = The acceleration due to gravity = 9.8 m/s²
Substituting the values, gives;
[tex]R = \dfrac{40^2 \times sin(2\times60^{\circ })}{9.8} \approx 141.4 \ m[/tex]
The distance away the ball will land ≈ 141.4 m
2) The maximum height is given m=by the following equation for vertical motion;
(v₀ × sin(θ))² = 2 × g × [tex]h_{max}[/tex]
Obtained from the equation of motion, v² = u² - 2×g×h where at maximum height;
v = 0 at maximum height, the ball stops upward motion
h = Height of motion = [tex]h_{max}[/tex] at maximum height
v, and u are the vertical component of the velocity, v₀
Substituting the values in the equation for the maximum height, gives;
(40 × sin(60))² = 2 × 9.8 × [tex]h_{max}[/tex]
(40 × (√3)/2)² = 1200 = 19.6 × [tex]h_{max}[/tex]
1200 = 19.6 × [tex]h_{max}[/tex]
[tex]h_{max}[/tex] = 1200/19.6 ≈ 61.22 m
The maximum height reached ≈ 61.22 m
3) The time to maximum height is given by the following equation of motion;
[tex]v_y[/tex] = v₀ × sin(θ) - g × t
[tex]v_y[/tex] = 0 at maximum height
We therefore have;
v₀ × sin(θ) = g × t
t = v₀ × sin(θ)/g = 40 × sin(60°)/9.8 = (40 ×(√3)/2)/9.8 = 3.535 seconds
Given that the motion of the ball is symmetrical about the maximum height, we have;
The time from ground level to maximum height = The time from the maximum height back to the ground level
The total time hang time = The time from ground level to maximum height + The time from the maximum height back to the ground level
The total time hang time ≈ 3.535 + 3.535 ≈ 7.07 seconds.
The total time hang time ≈ 7.07 seconds.
Which characteristics can be determined given only the information above? 1.) luster 2.) streak 3.) crystal size 4.) crystal structure PLEASE HELP ME!!!!!!
SCIENCE
Sarah is asked to sort out the list of ions and ionic compounds. How can Sarah differentiate between the ions and ionic compounds? Ions have a positive or negative charge, but an ionic compound's overall charge is zero. Ions have no charge, but ionic compounds have a positive charge. Ions have no charge, but ionic compounds have a negative charge. Ions have a positive or negative charge, but an ionic compound's overall charge is negative.
Answer:
Ions have a positive or negative charge, but an ionic compound's overall charge is zero.
Explanation:
Ionic compounds are compounds said to contain ions, which are atoms that have either lost electrons to be POSITIVELY CHARGED or gained electrons to be NEGATIVELY CHARGED. The negatively charged ions are called ANIONS while the positively charged ions are called CATIONS.
These cations (+ ions) and anions (- ions) make up ionic compounds in such a way that they give the ionic compound a net charge of ZERO. This is because the charges of the opposite ions that make up the ionic conpound are equal. For example, in the ionic compound CaCl2;
Ca is a cation with charge +2
Cl is an anion with charge -1, 2 atoms make a net charge of -2
When these two ions combine, they cancel out each other to form an ionic compound, CaCl2, with net charge 0 or neutral
Answer:
The answer is
A. Ions have a positive or negative charge, but an ionic compound's overall charge is zero
i got it right on edge 2023
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A ball is shot horizontally at 17.3m/s from the roof of a building 55.2 m tall, (use g = 9.8 m/s ^ 2) How far from the base of the building does the ball land?
Given that,
The initial speed of a ball, u = 17.3 m/s
It is shot from the roof of a 52 m tall building, h = 52 m
It is required to find the distance from the base of the building the ball land. Let the distance be d.
Final velocity of the ball, v = 0 (when it lands)
We can use third equation of motion to find it.
[tex]v^2-u^2=2ad[/tex]
a = -g
[tex]-u^2=-2gd\\\\d=\dfrac{u^2}{2g}\\\\d=\dfrac{(17.3)^2}{2\times 9.8}\\\\d=15.26\ m[/tex]
So, it will land at a distance of 15.26 m.